Means for fixing pulleys and the like to shafts



Dec. 18, 1945 Y w. J. E V-;ANS 591.302

MEANS FOR FIXING PULLEYS AND THE LIKE Tb SHAFTS I Filed April 1D, 1943 2Sheets-Sheet 1 F/GS- 4/- i I v v 4 I t annual-nun: I 47 or Wm. 'JEva n8,

i Attqm: I

Patented Dec. 18, 194

MEANS FOR FIXING PULLEYS AND THE 7 o SHAFTS I William James Evans,Bulwell, Nottingham,

England v Application April 10, 1943, Serial No. 482,643 In GreatBritain January 10, 1942 3 Claims. (01. 287-5233) This invention isconcerned with means for fixing pulleys and other, encircling membersgtoshafts against longitudinal and/or rotary motion in relation to thelatter. According to this invention, a device (e. g. a pulley) providedwith a bore for the reception of ashaft and being capable of beingclamped to said shaft, comprises two members through each of which thebore extends and which are capable of at least partial rotation inrelation to one another about the 7 axis of the bore, and havingengaging surfaces,

eccentric to the axis of the bore, for throwing out of alignment uponsuch-rotation theparts' of sive members having engag ng eccentricsurfaces.

Such a device may be utilised "as a coupling for connecting together theends of two shafts, the said shaft ends being positioned inside one ofthe members. Preferably but, not necessarily, the

engaging surfaces are cylindrical and comprise male and femaleeccentrics.

These and other features of the invention set out in the appended claimsare incorporated in the constructions now to be described with referenceto the accompanying drawings, in certain of which the devices is shownby way of example in the form of a pulley, and in which Figure 1 shows alongitudinal section, and Figure 2 an end elevation of apulley accordingto this invention, 7

, Figure 3 shows a longitudinal section of a modified device, 7

Figure 4 shows a longitudinal section, and Figure 5 an end elevation ofa further construction,

- Figure 6 shows a longitudinal section, and Figure 7 an end elevationof a still further construction, I

Figure 8 is a longitudinal section showingone application of theinvention to a coupling,

Figure 9 is a longitudinal section, and Figure 10 an end elevationshowing a split pulley,

Figures 11 and 12 are similar views of a further split pulley, while I Vr Figures 13 and 14 are perspective views of two members of a pulley orthe like, wherein the eccentric surfaces are not completely cylindrical.

plain bore for the shaft l0 extends through both of these members, butthe outer periphery of the member I 2 is eccentric to the bore and isreceived in an eccentric recess J3 in one end of the member II, theamount of eccentricity of the cylindrical outer surface of the member l2and of the cylindrical recess l3 being indicated by the arrow X in Fig.2. It will be appreciated that if the two members ll, l2 are rotated onein relation to the other, the eccentric surfaces will give rise to aforce tending to move the shafts bore in the member H out of alignmentwith the bore in the member l2 and so the two members will lock on theshaft. Suitable means may be provided (here shown as ribs M), on themember l2 for rotating the two members in relation to one another.

In Fig. .3 the pulley again comprises two members 2|, 22 to be mountedon the shaft l0. 'The plain bore for the shaft l0 extends through a boss2la on the member 2| and the said boss is provided with an eccentricrecess 23 for receiving a member 22 which is formed like a sleeve withits outer periphery eccentric to the shaft bore; said member 22 isfurther formed with a head or flange 24 provided with flats indicated bythe dotted lines 24' (e. g. of hexagonalform) to accommodate a spanner.

It will be seen that in this construction the pulley is 'mounted on theend of the shaft so that its rim projects beyond said end and the member22 is located inwards of the extremity 0 said projecting rim. Y :Figs. 4and 5 show the application of the invention to a split pulley 3|, thehub 3la of which is provided with a plain bore for the shaft 10. Aneccentric channel or recess 35 is formed in the endface of said hub, anda collar. member 32, having a plain bore for the shaft, is formed withan annular eccentric flange or projection 36. The said collar member ispositioned on the shaft l0 abutting the hub 3Ia, with the flange r 36ofthe collar received in the channel 35 'of the 'In Figs. 1 and 2 thepulley to be clamped on the plain shaft in against rotary and axialmovement thereon consists of two members, a main member ll of theappropriate drum-like shape, and a second member l2. As will be seen thehub, and upon relative rotation between the hub and collar, theirrespective bores tend to become 'misalined, and the pulley is thusfirmly secured "to the shaft. It will be seen from Fi 5 that the jointface between the two halves of the members 3| has a part c, d lying in adiametral plane,

parts b, c and d, e at right angles thereto so that "the said partsafford faces on the two. halves" of the pulley that move over oneanother when the pulley is being assembled round or detached from theshaft l0, and other faces a, b and e, f which lie in tangential planes.In order to se- 2 cure the two halves of the pulley together a.longitudinal key-way is formed in each half of the pulley at the faces12, c, d, e for the reception of a key 31, said keys extendingsubstantially parallel to the axis of the shaft Ill.

The member 32 ma be split as indicated by the lineah; the two halves ofth'eqsaid member 32 are held together because of the reception of theprojection 36 in the recess 35.

Fig. 6 shows that the one member 4| of the pulley may be built up from.a series of plates or laminations held together by means such .as rivets48. These laminations may be split as shown in Fig. 7, the two halvesbeingsecured together around the shaft by means such as the dove-tails4?. An eccentric member 4 2.is received Within an eccentric recess 43 atleast at pile .end of the member 4|, the shaft bore extending throughboth members 4!, 42.

i also illustrates that a de ice consisting .Of ameniber '41 with aneccentric member .42 at each end .ofitmayserve as a coupling to connecttogether two shaft ends indicated at Illa, {b. The extremities of thetwo shafts are located within the member AI. while one eccentric V .42surrounds one shaft and the other eccentric 42 surrounds the othershaft. It will be appreciated that byrotating each of .the members 42 inrelation to themember 4.! each .of th two .shaf-ts Jlla. 10b is clampedwithin the device and .01 {the shafts 1.0a, 1'01) are located andprovided at each end face with an eccentric projecting rim 55.. The twoend members 52 are formed with eccentric recesses 53 to accommodate thesaid members .56 ,so that said member 52 resembleend caps- If desired acollar '52 having its outer surface eccentric may fit around each shaftwithin the eccentric interior of projection 56 and correspondingeccentric recesses 53' in said members -2. x

Figsx.) and 1 0 ,s'howa further construction of split pulley. Thecentral member (5| i split diametrically as "indicated by the dottedline 9-9 n Fig. and is provided at each end face with an eccentric bosssuch as 61a. The end membersfiZ have their end faces formed toaccommodate the eccentrics 81a, as for example being provided withfemale eccentrics 63 so thatby rotating said members 62 in oppositedirections the device may 'belocked on the shaft. Each of the members'82 is also split on a joint face shown at med, 8,, a in Fig. 10, theportions b, c and d, 'e of said joint face being provided withkeywa-ysforthe reception of keys fil whereby the two"'-ha;lves areconnected together around the shaft 1'0.

the construction shown in *Figs. 11 and '12, 'tl'ie'member H is splito-nthe joint face a, b, c, 11 said joint face having a part b, c in adiametral plane :and parts a, b and c, d at right angles thereto, thesaid parts a, b and 'c, at providing faces on the two l'ia'lves of thedevice that move over one another when the .two halves "are beingassembled around or removedfrom the shafts Illa, IUIb. Ilhese said facesare cut with 'key ways for the reception of keys "H. An eccentric memberis provided at least at one end of member-"I11. By way of example twoeccentric members 12 and A12 {0f different shapes :are

shown, the said eccentric members being received in eccentric bores 13and I13 respectively. Each said member 12 or H2 is split into twohalves, the split being indicated by the dotted lines s in Figs. 11 and12. The two halves" of each member 12, I12 are held against separationbecause of their reception within themember ll. It is desirable,.however, that relative axial movement between the two "halves of member12 or I12 shall be prevented, and for this reason they are connectedtogether at the joint face by means of an integral key It. 1

in the construction shown in Figs. 13 and 14 the eccentric surfacesconnecting the two mem- :bers 8|, 82 are not completely cylindrical. Themember 82 is formed with a suitable number of arcuate slots each ofwhich is eccentric to the shaft bore. Pins 88 projecting from the endface of the other member 8| fit in these slots 89, said pins beinglikewise eccentric to: the bore. Each of the members 81 and 82. may beformed by laminations as: shown and the pins '88 may constitute the endsof rivets holding the laminations of member f8'l together. Thisconstruction peru n-its all the laminations constituting both membore 81, 82, to be identical.

If, .a quick clamping and release movement is required, each member maybeprovided with a projection that may be struck by a hammer.

Although the invention been described with particular-reference topulleys and couplings itwill be appreciated that it is not limited inits application and may advantage be applied to other members such ascams and wheels.

I claim:

1. A readily mountable and demountable pulley, shaft -.coupling .or likedevice, comprising a memberhaving an eccentric element, and a plain borefor the reception of a chart, said member being split longitudinallyinto parts having opposed complementai faces withinkthe periphery of themember; a second member having a bore for the shaft, and an eccentricelement mating with said first named eccentric element, whereby relativerotation between'the two members tends to producemisalinement of theirrespective bores which firmlysecures the device to the shaft; and

"means co-acting with said complementa-l faces of the first member -forpreventing separating movement of the parts of each member transverselyof the shaft.

'2. A readily'cnountable and demounta'ble pulley, shaft coup-ling orlike device, comprising a member having a plain bore for the receptionof a shaft, said member being split longitudinally into parts havingopposed complemental faces the periphery of the member, portions of saidfaoes being disposed substantially a diametric tplanzelof'the memhcrnndother portions of said facesextending -.at substantially right angles tosaid diametric portions; eccentric [means for locking saidmember to theshaft; randmeans .engageable :with :said singularly disposed portions ofthe .complemental races of said member parts. for nreventingzsenanetion:of he rna ts transversely of :the shaft.

3. A device according to claim wherein .the :an urlany ld sposedpo tionsof the comp m faces :cf themcmber partsare provided with-matinglongitudinal lreyways, there bein -l es disposed therein to prevent thetransverse separation of the parts.

WILLIAM JAMES EVANS.

